Bar stool



FIG. 1 is a perspective view of the bar stool of the present design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a right side elevation view thereof; the left side elevation view being a mirror image thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines shown in the drawings depict features that form no part of the claimed design. 

CLAIM The ornamental design for a bar stool, as shown and described. 